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Under the terms of the Creative Commons Attribution License 3.0 (CC-BY)We present x-ray absorption near edge structure (XANES) and x-ray magnetic circular dichroism (XMCD) measurements performed at the Co K and W L 2,3 edges, on amorphous Co-W alloy nanoparticles, and a comparison with those on a bulk Co 3W alloy. A strong hybridization between the 4p and 3d orbitals in Co and the 5d band in W are observed, resulting in an induced magnetic moment in the W atoms. The orbital to spin moment ratio in W of all these Co-W systems is positive, suggesting a parallel orientation of the two moments. This is opposite to the expected antiparallel coupling for atoms with a less-than-half-filled 5d band, according to Hund's third rule. These findings are supported by calculations of the electronic density of states projected at the Co 3d and W 5d orbitals, as well as XANES spectra and XMCD signals at the Co K and W L 2,3 edges in a Co 3W system. © 2012 American Physical Society.The financial support of the Spanish MINECO MAT2011-23791 and Aragonese DGA-IMANA (co-funded by the European Social Fund) projects is acknowledged. A.I.F. acknowledges a CSIC JAE2008-Predoc grant.Peer Reviewe

physical review b

Breakdown of Hund's third rule in amorphous Co-W nanoparticles and crystalline Co<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub></mml:math>W alloys

Breakdown of Hund's third rule in amorphous Co-W nanoparticles and crystalline Co3W alloys